EP1424219B1 - Luftreifen mit notlauffähigkeit - Google Patents

Luftreifen mit notlauffähigkeit Download PDF

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Publication number
EP1424219B1
EP1424219B1 EP02762963A EP02762963A EP1424219B1 EP 1424219 B1 EP1424219 B1 EP 1424219B1 EP 02762963 A EP02762963 A EP 02762963A EP 02762963 A EP02762963 A EP 02762963A EP 1424219 B1 EP1424219 B1 EP 1424219B1
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Prior art keywords
weight
rubber
parts
less
conjugated diene
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English (en)
French (fr)
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EP1424219A4 (de
EP1424219A1 (de
Inventor
Daisuke THE YOKOHAMA RUBBER CO. LTD KANENARI
Kazuto THE YOKOHAMA RUBBER CO. LTD YAMAKAWA
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0008—Compositions of the inner liner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0025—Compositions of the sidewalls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre

Definitions

  • the present invention relates to a pneumatic tire having a runflat capability, more particularly relates to a pneumatic tire using a specific member for an inner liner and further a reinforcing rubber so as to greatly reduce the weight of the tire and to reduce a heat buildup as well as to extend the running distance at the time of a puncture.
  • FIG. 1 there has been known a safety tire in which a reinforcing rubber 5 in the shape of crescent is inserted between a carcass 3 and an inner liner layer 4 in the side wall part 2 of a pneumatic tire 1.
  • 6 indicates a cap tread
  • 7 indicates a bead filler
  • 8 indicates a belt layer
  • 9 indicates a bead.
  • the reinforcing rubber layer 5 is too thick, there was the problem that the weight is increased. Further, if driven on in a state with the air expelled, the side part 2 will greatly flex and heat will build up, and therefore an inner liner layer 4 of butyl rubber having a large heat buildup will immediately peel off and break. Even if repairing the puncture before the reinforcing rubber layer 5 breaks, there was the problem that sometimes the tire could no longer be reused.
  • JP-A-10-35232 discloses a pneumatic tire having a runflat capability in accordance with the preamble of claim 1, provided with a crescent-shaped reinforcing rubber layer (10) at the side part thereof comprising an inner layer (7), which comprises a thermoplastic elastomer composition containing (A) at least one thermoplastic resin having an air permeation coefficient of 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or less and a Young's modulus of more than 500 MPa and (B) at least one elastomer component having an air permeation coefficient of 50 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or more and a Young's modulus of 500 MPa or less each in an amount of at least 30% by weight based upon the total polymer components and having an air permeation coefficient of 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or less.
  • JP-A-11-010779 discloses a solvent-free pressure-sensitive adhesive composition for providing a rubber/thermoplastic resin laminate.
  • EP 0 943 656 discloses a pneumatic, runflat tire construction in which a runflat insert is arranged between an inner liner and a carcass.
  • the sidewall insert is formed of an ethylenic unsaturated nitrile-conjugated diene-based highly saturated copolymer rubber and a metal salt of an ethylenically unsaturated carboxylic acid (zinc methacrylate).
  • This application further teaches the inclusion of an organic peroxide in the relevant rubber composition to carry out the curing/cross-linking of the system. Further, it is taught that a bonding rubber layer strongly bonds the runflat insert and the adjoining rubber layers (i.e. carcass), wherein said bonding rubber layer is formed of
  • the object of the present invention is to solve the above problems and to provide a pneumatic tire having a runflat capability which is capable of reducing the weight of the tire, suppressing heat buildup, and extending the running distance of the tire at the time of a puncture.
  • a pneumatic tire as defined in claim 1 having a runflat capability provided with a crescent shaped reinforcing rubber layer in the side part thereof comprising an inner liner, which comprises a thermoplastic elastomer composition containing (A) at least one thermoplastic resin having an air permeation coefficient of 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or less and a Young's modulus of more than 500 MPa and (B) at least one elastomer component having an air permeation coefficient of 50 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or more and a Young's modulus of 500 MPa or less, respectively, each in an amount of at least 30 % by weight based upon the total polymer components and having an air permeation coefficient of 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or less.
  • the pneumatic tire having a runflat capability wherein said inner liner compose of said thermoplastic elastomer composition and a carcass and a reinforcing rubber layer are bonded, by vulcanization, with an adhesive comprising 100 parts by weight of a total amount of at least 30 parts by weight of a polymer having a carboxyl group, epoxy group or isocyanate group and the balance of a styrene-butadiene-styrene-based copolymer or styrene-isoprene-styrene-based copolymer or a partially hydrogenated product thereof, into which 20 to 150 parts by weight of a tackifier resin is compounded.
  • an adhesive comprising 100 parts by weight of a total amount of at least 30 parts by weight of a polymer having a carboxyl group, epoxy group or isocyanate group and the balance of a styrene-butadiene-styrene-based copolymer or sty
  • the crescent shaped reinforcing rubber of the side part thereof comprises a rubber composition composed of 100 parts by weight of a total rubber amount of a rubber containing at least 40 parts by weight of an ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugated diene units of 30 % by weight or less, into which 120 parts by weight or less of a metal salt of an ethylenic unsaturated carboxylic acid and an organic peroxide are compounded.
  • a rubber composition which comprises 100 parts by weight of a total rubber amount of 50 to 85 parts by weight of at least one diene-based rubber selected from the group comprised of a natural rubber, polyisoprene rubber, polybutadiene rubber, and conjugated diene-aromatic vinyl copolymer rubber and 15 to 50 parts by weight of an ethylenic unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugated diene units of 30 % by weight or less, and 10 to 60 parts by weight of a metal salt of an ethylenic unsaturated carboxylic acid, 0.3 to 10 parts by weight of an organic peroxide and 5 to 50 parts by weight of a co-agent (i.e., a co-crosslinking agent) in the state of liquid at room temperature and having an acryl group, methacryl group, or allyl group.
  • a co-agent i.e., a co-crosslinking agent
  • FIG. 1 is a view of the cross-section of a pneumatic tire having a runflat capability of a side reinforced type.
  • thermoplastic elastomer composition containing (A) at least one thermoplastic resin having an air permeation coefficient of 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or less, preferably 0.1 x 10 -12 to 10 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg and a Young's modulus of more than 500 MPa, preferably 510 to 3000 MPa, and (B) at least one elastomer component having an air permeation coefficient of 50 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or more, preferably 50 x 10 -12 to 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg and a Young's modulus of 500 MPa or less, preferably 0.01 to 100 MPa, each in an amount of at least 30 % by weight, preferably 40 to 70 % by weight, based upon the total
  • the side reinforcing rubber of the tire is formed by a rubber composition composed of 100 parts by weight of a total rubber amount containing at least 40 parts by weight, preferably 40 to 60 parts by weight, of an ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugated diene units of 30 % by weight or less, preferably 10 to 25 % by weight, into which 120 parts by weight or less, preferably 20 to 80 parts by weight, of a metal salt of an ethylenic unsaturated carboxylic acid and an organic peroxide are compounded, it is possible to maintain the runflat capability even when making the side reinforcing rubber thinner and therefore possible to further reduce the weight of the tire.
  • the rubber composition and the thermoplastic elastomer composition are firmly bonded at the side part of the tire, the peeling of the inner linear is greatly reduced even when driving on the tire at zero pressure, and the runflat capability of the tire can be greatly improved.
  • thermoplastic resin compounded, as the component (A), in the thermoplastic elastomer composition used for the inner liner member of a pneumatic tire having a runflat capability is at least one thermoplastic resin having an air permeation coefficient of 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or less, preferably 0.1 x 10 -12 to 10 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg and a Young's modulus of more than 500 MPa, preferably 510 to 3000 MPa.
  • the amount compounded is at least 30 % by weight, preferably 30 to 60 % by weight, based upon the entire polymer components.
  • thermoplastic resin component (A) for example, the following thermoplastic resins and any resin compositions of the same or containing the same may be mentioned. These may also be thermoplastic resin compositions containing therein conventional additives such as plasticizers, softening agents, fillers, reinforcing agents, processing aids, stabilizers, antioxidants.
  • Polyamide-based resins for example, Nylon 6 (N6), Nylon 66 (N66), Nylon 46 (N46), Nylon 11 (N11), Nylon 12 (N12), Nylon 610 (N610), Nylon 612 (N612), Nylon 6/66 copolymer (N6/66), Nylon 6/66/610 copolymer (N6/66/610), Nylon MXD6, Nylon 6T, Nylon 6/6T copolymer, Nylon 66/PP copolymer, and Nylon 66/PPS copolymer), polyester-based resins (for example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET/PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, polybutylene terephthalate/polytetramethylene glycol copolymer, polyoxyalkylene diimidodiacid/poly
  • the elastomer component to be compounded, as the component (B), into the thermoplastic elastomer composition used for the inner liner member of the pneumatic tire having a runflat performance according to the present invention is an elastomer composition composed of at least one elastomer having an air permeation coefficient of 50 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg or more, preferably 50 x 10 -12 to 100 x 10 -12 cc ⁇ cm/cm 2 ⁇ sec ⁇ cmHg and a Young's modulus of 500 MPa or less, preferably 0.01 to 100 MPa, or any blends thereof or those containing therein necessary amounts of conventional compounding agents generally compounded into elastomers to improve the dispersability, heat resistance, etc.
  • the elastomers such as, for example, a reinforcing agent, filler, crosslinking agent, softening agent, antioxidant or processing aid.
  • the amount compounded is at least 30 % by weight preferably 40 to 70 % by weight, based upon the entire polymer ingredients.
  • the elastomer forming the elastomer component is not particularly limited so long as it has the above air permeation coefficient and Young's modulus valves, and, for example, the following may be mentioned:
  • Diene-based rubbers and their hydrogenated products for example, NR, IR, epoxylated natural rubber, SBR, BR (high cis BR and low cis BR), NBR, hydrogenated NBR, hydrogenated SBR), olefin-based rubbers (for example, ethylenepropylene rubber (EPDM, EPM), maleic acid-modified ethylenepropylene rubber (M-EPM), butyl rubber (IIR), isobutylene and aromatic vinyl or diene-based monomer copolymers, acryl rubber (ACM), and ionomers), halogen-containing rubbers (for example, Br-IIR, Cl-IIR, brominated isobutylene p-methylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydrin rubber (CHR, CHC), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid-modified chlorinated polyethylene (M-CM), silicone
  • the ratio of the thermoplastic resin (A) and the elastomer ingredient (B) in the thermoplastic elastomer composition used for the inner liner of the pneumatic tire having a runflat capability according to the present invention may be suitably determined by the balance of the thickness, air barrier property and flexibility of the film, but the preferable range is, in terms of weight ratio, 10/90 to 90/10, more preferably 20/80 to 85/15.
  • the polymer component having a carboxyl group, epoxy group or isocyanate group which forms the adhesive used for bonding, by vulcanization, the inner liner and the carcass in the pneumatic tire having a runflat capability of the present invention
  • NR, SBR, BR, IR, IIR, EPDM, SBS, SIS, SIBS, SIPS, PE, EEA or another polymer modified with maleic acid anhydride or modified by carboxyl
  • these polymers copolymerized with acrylic acid (AA), methacrylic acid (MA), allylglycidyl ether (AGE), glycidyl methacrylate (GMA), etc. or reacted with peracetic acid to epoxidize them may be used.
  • a polymer having an isocyanate group can be produced by adding, to a polymer having a hydroxy group in the molecule thereof or at its molecule's end, an excess amount of di- or tri-isocyanate etc.
  • an elastomer having thermoplasticity for example, maleic anhydride-modified SBS, E-GMA-VA, E-GMA-MA, epoxidized SBS, maleic anhydride-modified BR, maleic anhydride-modified IR, etc. are preferable.
  • the amount compounded of these polymer components is suitably at least 30 parts by weight, preferably 30 to 70 parts by weight. If the amount compounded is less than 30 parts by weight, the adhesion to the thermoplastic elastomer becomes insufficient.
  • tackifier resin compounded into the adhesive for example, a terpene resin, pinene resin, aromatic modified terpene resin, hydrogenated terpene resin, terpenephenol copolymer resin, styrene resin, rosin ester-based resin, cumarone-indene resin, petroleum resin, etc. may be mentioned.
  • the tackifier resin is selected according upon the compatibility with the polymer and compatibility with the object to be adhered, but in particular, a terpene-based resin, its derivatives (for example, a terpene resin, pinene resin, dipentene resin), or their modified products (for example, aromatic modified terpene resin, hydrogenated terpene resin, terpenephenol resin), rosin ester-based resin, etc. are preferable.
  • the amount compounded of these tackifier resins is preferably 20 to 150 parts by weight, more preferably 30 to 100 parts by weight, based upon 100 parts by weight of the polymer components forming the adhesive.
  • the amount compounded is less than 20 parts by weight, the tack at the time of tire formation is insufficient, while if more than 150 parts by weight, the cohesive power of the adhesive is insufficient and the adhesive is liable to agglomerate and breakage is liable to occur at the time of tire formation.
  • a rubber composition composed of 100 parts by weight of a total amount of a rubber containing at least 40 parts by weight, preferably 40 to 60 parts by weight, of an ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugated diene units of 30 % by weight or less, preferably 10 to 25 % by weight, into which 120 parts by weight or less, preferably 20 to 80 parts by weight, of a metal salt of an ethylenic unsaturated carboxylic acid and an organic peroxide is used for the crescent shaped reinforcing rubber of the side part of the tire, the volume of the reinforcing rubber can be reduced, whereby a large reduction in weight of the tire can be achieved.
  • the above ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber is already known. It is a copolymer of ethylenically unsaturated nitrile such as acrylonitrile, methacrylonitrile, and conjugated diene monomers such as 1,3-butadiene, isoprene, 1,3-pentadiene; and multi copolymer of the above two types of monomers and monomers capable of copolymerizing with these two types of monomers such as vinyl aromatic compounds, (meth)acrylic acid, alkyl(meth)acrylate, alkoxyalkyl(meth)acrylate cyanoalkyl(meth)acrylate.
  • ethylenically unsaturated nitrile such as acrylonitrile, methacrylonitrile, and conjugated diene monomers such as 1,3-butadiene, isoprene, 1,3-pentadiene
  • an acrylonitrile-butadiene copolymer rubber acrylonitrile-butadiene copolymer rubber, acrylonitrile-isoprene copolymer rubber, acrylonitrile-butadiene-isoprene copolymer rubber, acrylonitrile-butadiene-acrylate copolymer rubber, acrylonitrile-butadiene-acrylate-methacrylic acid copolymer rubber, etc. may be mentioned.
  • These rubbers contain 10 to 50 % by weight, preferably 20 to 35 % by weight, of ethylenically unsaturated nitrile units and the content of the conjugated diene unit is reduced to 30 % by weight or less, preferably 10 to 25 % by weight, by a means such as partial hydrogenation of the conjugated diene units.
  • metal salt of an ethylenically unsaturated carboxylic acid used in the present invention, a metal salt such as zinc, magnesium, calcium, aluminum salt of unsaturated monocarboxylic acid such as (meth)acrylic acid, crotonic acid, monoester of an unsaturated dicarboxylic acid such as maleic acid, fumaric acid or another unsaturated dicarbon, monomethyl maleate, monoethyl maleate may be mentioned.
  • the preferable metal salt of an ethylenic unsaturated carboxylic acid is zinc (meth)acrylate (i.e., correctly, zinc di(meth)acrylate).
  • a predetermined amount of a metal salt of an ethylenically unsaturated carboxylic acid is not particularly limited, but it is possible to use a mixer generally used in the rubber industry such as a roll, Banbury mixer, kneader, single-screw extruder, twin-screw extruder, etc.
  • zinc (meth)acrylate in addition to the method of directly mixing, into the ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber, for example, zinc (meth)acrylate, it is also possible to adopt the method of first mixing therein zinc compound such as zinc oxide, zinc carbonate, followed by sufficiently dispersing, and then mixing, or causing the absorption, with (meth)acrylic acid to produce, in situ, zinc (meth)acrylate in the polymer. This method is preferable since an extremely good dispersion of zinc (meth)acrylate is obtained.
  • a composition composed of an ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber, into which zinc (meth)acrylate and a zinc compound are dispersed in advance.
  • a compound is available as the "ZSC” (trademark) series made by Nippon Zeon, for example ZSC2295, ZSC2295N, ZSC2395, and ZSC2298.
  • an ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber crosslinked with an organic peroxide is used.
  • the organic peroxide usable in the present invention one are those usually used in the peroxide vulcanization of rubber are dicumyl peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, benzoyl peroxide, 2,5-dimethyl(t-butylperoxy)hexine, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-mono(t-butylperoxy)hexane, ⁇ , ⁇ '-bis(t-butylperoxy-m-isopropyl)hexene, etc.
  • One or more of these organic peroxides may be used.
  • the compounding amount thereof is not particularly limited, but preferably is 0.2 to 10 parts by weight, more
  • the rubber composition composed of the ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber, into which predetermined amounts of a metal salt of an ethylenic unsaturated carboxylic acid and an organic peroxide are compounded may further suitably contain therein, for example reinforcing agent such as carbon black, silica, crosslinking aids such as triallyl isocyanulate, a higher ester of methacrylic acid, a phthalic acid diallyl ester, m-phenylene bismaleimide, 1,2-polybutadiene, other conventional additives generally used in the rubber industry such as a plasticizer, oil, antioxidant, stabilizer, adhesive, resin, processing aid, etc.
  • reinforcing agent such as carbon black, silica
  • crosslinking aids such as triallyl isocyanulate
  • a higher ester of methacrylic acid a phthalic acid diallyl ester
  • m-phenylene bismaleimide 1,2-
  • a rubber composition comprised of the ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber, into which a metal salt of an ethylenic unsaturated carboxylic acid and an organic peroxide are compounded, to ensure a firm adhesion between the reinforcing rubber and the carcass, between these members a rubber composition is arranged which is composed of 100 parts by weight of a total amount of (a) 50 to 85 parts by weight, preferably 50 to 70 parts by weight, of at least one diene-based rubber selected from the group consisting of natural rubber, polyisoprene rubber, polybutadiene rubber, and conjugated diene-aromatic vinyl copolymer rubber and (b) 15 to 50 parts by weight, preferably 30 to 50 parts by weight, of an ethylenically unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjug
  • a methacrylic acid ester for example, a methacrylic acid ester, triallyl isocyanulate, a metal salt of methacrylic acid or acrylic acid, phthalic acid diallyl ester, 1,2-polybutadiene, etc. may be mentioned.
  • the adhesive rubber composition according to the present invention by using a process (two-stage mixing method) of first mixing an ethylenic unsaturated nitrile-conjugated diene-based highly saturated rubber (b) having a content of conjugated diene units of 30 % or less and a metal salt of an ethylenic unsaturated carboxylic acid (c), then compounding thereinto the diene-based rubber (a) and the organic peroxide (d), co-agent (e), etc., the processability and adhesion of the adhesive rubber composition are improved.
  • a process two-stage mixing method of first mixing an ethylenic unsaturated nitrile-conjugated diene-based highly saturated rubber (b) having a content of conjugated diene units of 30 % or less and a metal salt of an ethylenic unsaturated carboxylic acid (c), then compounding thereinto the diene-based rubber (a) and the organic peroxide (d), co-
  • the adhesive rubber composition may suitably contain therein compounding agents generally compounded into rubber, such as, for example, filler such as carbon, silica, conventional additives such as an antioxidant, plasticizer, processing aid, resin, adhesive, crosslinking aid, vulcanization aid, vulcanization accelerator, tackifier.
  • compounding agents generally compounded into rubber, such as, for example, filler such as carbon, silica, conventional additives such as an antioxidant, plasticizer, processing aid, resin, adhesive, crosslinking aid, vulcanization aid, vulcanization accelerator, tackifier.
  • the thickness of the adhesive rubber layer is preferably 0.2 to 1.5 mm, more preferably 0.5 to 1.0 mm. By this range of the thickness, the safety tire can be lightened and a desired superior runflat capability can be obtained.
  • the compounding compositions "a” to “g” shown in the following Table I to Table III were used to form reinforcing liners and inner liner layers of predetermined formulations and thicknesses shown in Table IV. These were used for building runflat tires having a size of 245/45ZR17 in a normal procedure. These were used as test tires.
  • Runflat running test A test tire was attached to the front right side of a 2500 cc FR passenger car and run counterclockwise on a oval road in a state of an air pressure of 0 kPa at 90 km per hour. The running distance until the tire broke down and could not be driven on was indicated indexed to the tire of the Reference Example as "100". The larger the number, the better the runflat distance.
  • Liner delamination After the running test, breakdown at the inner surface of the tire was visually examined and evaluated in three rankings: A: almost no delamination, B: delamination at part of the circumference, and C: delamination over the entire tire circumference.
  • Table I Inner Liner Rubber Formulation Row Material Commercial Product Manufacturer Formulation "a” (parts by weight) Formulation "b” (parts by weight) Natural rubber TSR20 - 20 - Brominated butyl rubber Bromobutyl 2255 Exxon Mobil Chemical 80 - Br-IPMS EXXPRO 89-4 Exxon Mobil Chemical - 100 PA 6/66 Ube Nylon 5033B Ube Industries - 30 PA 11 Rilsan BESN 0 TL Atfina Japan - 40 MAH-EEA HRP AR201 Mitsui Dupont Polychemical - 10 Carbon black Diablack E Chubu Carbon 60 - Zinc oxide Zinc White #3 Seido Chemical 4 0.2 Stearic acid Beads Stearic Acid Kao 1 0.6 Zinc stearate Zinc stearate Seido Chemical - 0.3 Aromatic oil Extract No.

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  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
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Claims (4)

  1. Luftreifen mit Runflat-Eigenschaft, ausgestattet mit einer sichelförmigen verstärkenden Kautschukschicht (5) an seinem Seitenteil, die eine innere Schicht (4) umfasst, welche eine thermoplastische Elastomerzusammensetzung umfasst, enthaltend:
    (A) mindestens ein thermoplastisches Harz mit einem Luftdurchlässigkeitskoeffizienten von 100 x 10-12 cc·cm/cm2·sec·cmHg oder weniger und einem Elastizitätsmodul von mehr als 500 MPa und
    (B) mindestens eine Elastomerkomponente mit einem Luftdurchlässigkeitskoeffizienten von 50 x 10-12 cc·cm/cm2·sec·cmHg oder mehr und einem Elastizitätsmodul von 500 MPa oder weniger, jeweils in einer Menge von mindestens 30 Gew.% auf Basis der gesamten Polymerkomponenten, und die einen Luftdurchlässigkeitskoeffizienten von 100 x 10-12 cc·cm/cm2·sec·cmHg oder weniger hat,
    dadurch gekennzeichnet, dass der sichelförmige verstärkende Kautschuk des Seitenteils eine Kautschukzusammensetzung umfasst, die aus 100 Gew.-Teilen der Gesamtkautschukmenge eines Kautschuks aufgebaut ist, der mindestens 40 Gew.-Teile eines ethylenisch ungesättigten, Nitril-konjugierten hoch gesättigten Kautschuk auf Dien-Basis mit einem Gehalt von konjugierten Dien-Einheiten von 30 Gew.% oder weniger enthält, in den 120 Gew.-Teile oder weniger eines Metallsalzes einer ethylenisch ungesättigten Carbonsäure und ein organisches Peroxid zugemischt sind,
    und dadurch, dass zwischen dem sichelförmigen Verstärkungskautschuk (5) und einer Karkasse (3) eine adhäsive Kautschukzusammensetzung bereitgestellt ist, die folgendes umfasst:
    100 Gew.-Teile einer Gesamtkautschukmenge von 50 bis 85 Gew.-Teilen mindestens eines Kautschuks auf Dien-Basis, der aus der Gruppe ausgewählt ist, die aus natürlichem Kautschuk, Polyisoprenkautschuk, Polybutadienkautschuk und konjugiertem Dien-aromatischen Vinylcopolymer-Kautschuk und 15 bis 50 Gew.-Teilen eines ethylenisch ungesättigten, Nitril-konjugierten hoch gesättigten Kautschuks auf Dien-Basis mit einem Gehalt von konjugierten Dien-Einheiten von 30 Gew.% oder weniger besteht, und
    10 bis 60 Gew.-Teilen eines Metallsalzes einer ethylenisch ungesättigten Carbonsäure,
    0,3 bis 10 Gew.-Teilen eines organischen Peroxids und
    5 bis 50 Gew.-Teilen eines Zusatz-Mittels, das bei Raumtemperatur im flüssigen Zustand vorliegt und eine Acrylgruppe, Methacrylgruppe oder Allylgruppe aufweist.
  2. Luftreifen gemäß Anspruch 1, worin das Metallsalz einer ethylenisch ungesättigten Carbonsäure Zinkacrylat oder Zinkmethacrylat ist.
  3. Luftreifen gemäß Anspruch 1, worin die innere Lage (4) die genannte thermoplastische Elastomerzusammensetzung umfasst, und die Karkasse und die verstärkende Kautschukschicht mit dieser inneren Lage (4) mittels Vulkanisierung mit einem Adhäsiv-Mittel verbunden sind, das 100 Gew.-Teile einer Gesamtmenge von mindestens 30 Gew.-Teilen eines Polymers mit einer Carboxylgruppe, Epoxygruppe oder Isocyanatgruppe und als Restbetrag ein Copolymer auf Styrol-Butadien-Styrol-Basis oder ein Copolymer auf Styrol-Isopren-Styrol-Basis oder ein partielles Hydrierungsprodukt davon, in die 20 bis 150 Gew.-Teile eines Haftungs-vermittelnden Harzes zugemischt sind.
  4. Luftreifen gemäß Anspruch 3, worin das Haftungsvermittelnde Harz ein Harz auf Terpen-Basis oder ein Derivat oder modifiziertes Harz davon ist.
EP02762963A 2001-09-05 2002-09-02 Luftreifen mit notlauffähigkeit Expired - Lifetime EP1424219B1 (de)

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JP2001269232 2001-09-05
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PCT/JP2002/008886 WO2003029029A1 (fr) 2001-09-05 2002-09-02 Pneumatique pouvant rouler a plat

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CN1317142C (zh) 2007-05-23
WO2003029029A1 (fr) 2003-04-10
JP3770892B2 (ja) 2006-04-26
DE60239811D1 (de) 2011-06-01
EP1424219A4 (de) 2009-03-25
US20040031550A1 (en) 2004-02-19
CN1473116A (zh) 2004-02-04
US7117911B2 (en) 2006-10-10
JPWO2003029029A1 (ja) 2005-01-13
EP1424219A1 (de) 2004-06-02

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